DNM1L-related encephalopathy due to mitochondrial and peroxisomal fission defect

DNM1L-related encephalopathy due to mitochondrial and peroxisomal fission defect is a rare genetic brain disorder caused by changes (mutations) in the DNM1L gene. This gene provides instructions for making a protein called dynamin-related protein 1 (DRP1), which is essential for dividing mitochondria and peroxisomes — tiny structures inside cells that produce energy and break down fats. When this protein does not work properly, these structures cannot divide normally, leading to problems with energy production and cellular function, especially in the brain. Children with this condition typically develop severe seizures (epilepsy) that are difficult to control, along with developmental delay or regression, meaning they may lose skills they previously had. Other common features include abnormal muscle tone (either too floppy or too stiff), movement problems, poor head growth (microcephaly), and visual impairment. Some children may also have elevated blood lactate levels, a sign of impaired energy metabolism. The severity can vary, but many affected children experience significant neurological decline over time. There is currently no cure for this condition. Treatment focuses on managing symptoms, particularly controlling seizures with anti-epileptic medications, supporting nutrition, and providing physical and occupational therapy. Some patients may benefit from metabolic supplements, though evidence is limited. Research into targeted therapies is ongoing, and genetic counseling is recommended for affected families. The condition is also known as encephalopathy due to defective mitochondrial and peroxisomal fission, lethal encephalopathy due to DNM1L deficiency, or DNM1L-related epileptic encephalopathy.

Bring these to your next appointment

• Q1.What specific DNM1L mutation does my child have, and what does it mean for their prognosis?,What seizure medications do you recommend, and what are the side effects we should watch for?,Would the ketogenic diet be appropriate for my child's seizure management?,Are there any clinical trials or research studies my child might be eligible for?,What therapies (physical, occupational, speech) should we start, and how often?,What emergency plan should we have in place for prolonged seizures or metabolic crises?,Should other family members be tested for the DNM1L gene change, and what are the chances of this happening again in a future pregnancy?

Common questions about DNM1L-related encephalopathy due to mitochondrial and peroxisomal fission defect

Related conditions

Other rare diseases commonly researched alongside DNM1L-related encephalopathy due to mitochondrial and peroxisomal fission defect.

• Leigh syndrome→